<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        /* 
        
         */
        h1{
            background-color:red;
        }
        @media print{
           h1{
            background-color: green;
           }
        }
        @media screen {
            h1{
                background-color: blue;
            }
        }
    </style>
</head>
<body>
    <h1>123</h1>
</body>
</html>